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Iron is a key nutrient for a healthy immune system, growth and brain development - but levels are not shown on the products' labelling.

It’s a good idea to test your soil — a survey of heavy metals, nutrients, minerals and pH levels costs less than $200 — and consider all the options for repairing it, soil scientists said.

The algae bloom was the result of an upswell in the ocean that brought up enough nutrients to the surface to allow the algae to thrive, he said.

Bügel, who is leading efforts to refine that system, emphasized that many processed foods still provide key nutrients and can be part of a balanced diet.

Both areas were tested for metals, nutrients, polychlorinated biphenyls and polycyclic aromatic hydrocarbons, which are all chemicals that may be found in water runoff based on previous California wildfires, officials said.